Face-plate jaw



(No Model.)

A. P. GUSHMAN. PAGE PLTE JAW.

No. 435,405. Patented Sept. 2, 1890.

w SS 4 UNITED STATES PATENT OEEICE. E

AUSTIN F. CUSHMAN, OF HARTFORD, CONNECTICUT.

FAC E- PLATE JAW.

SPECIFICATION forming part of Letters Patent No. 435,405, datedSeptember 2, 1890.

Application filed February 19, 1890. Serial Nc. 341,006. (No model.)

To all whom it may concern:

Be it known that I, AUSTIN F. CUsHMAN, a citizen of the United States,residing at Hartford, in the count-y of Hartford and State ofConnecticut, have invented certain new and useful Improvements inFacePlate Jaws, of which the following is a specification.

My invention relates to that class of devices used for holding orclamping the work or material being drilled, planed, or otherwiseoperated upon; and the invention consists in a novel construction of thework-holder or faceplate77 jaw, as I term it, whereby the use of large,heavy, and expensive chucks is dispensed with.

In the drawings, Figures l and 2 are perspective views of my improveddevice; Figs. 3 and 4, sectional views of the same, taken on lines atright angles to each other; and Fig. 5, a view of the detachable plateused to adapt the j aw for use on certain forms of face-plates.

A indicates a hollow shell or casing, open along its upper side from endto end to receive the sliding jaw B, the sides of thel jaw and of theopposingwalls of the shellbeing tongued and grooved, as shown.

C indicates a screw, squared at both ends to receive a wrench and seatedor journaled near each end in a lug d, rising from the bottom b of theshell or casing, as shown in Figs. 3 and 4. This screw engages with thethreaded lower face of the sliding jaw, and, as the latter is preventedfrom rising off the screw by means of the tongues and grooves beforementioned, it (the said jaw) willbe caused to move back and forth in theshell or casing, according to the direction in which the screw isturned. It will be seen that the end walls of the shell or easing arecut away, so that lthe sliding jaw may be projected beyond either end ofthe shell or casing, or removed entirely therefrom and reversed end forend.

The bottom face of the shell or casing A is advisably provided with alongitudinal groove or channel c, which is adapted to receive the platesH, which latter are adapted to project into the T-groove of theface-plate D, as shown in Fig. 3, the plates serving to guide the shellor casing (and the parts carried thereby) in its movements upon thefaceplate. The plates H are held in place by screws I, Figs. 8, 4, and5, which pass through face-plate by bolts F, screwing into holes g,

. tapped into the shell or casing.

Some forms of face-plates are provided with a series of radial slots(not shown) to receive a bolt or bolts E, which latter pass up throughthe slots and through a perforated lug e, projecting from each end ofthe shell or casing A. A nutf is applied to the upper end of each bolt Eto clamp the jaw firmly in position upon the face-plate, the end wallsof the shell or casing being undercut, as shown in Figs. l, 2, and et,to receive the nuts.

From the foregoing description it will be seen that the jaws Inay bereadily moved and adjusted. Two or more of these jaws bolted to theface-plate of a lathe,'or to the table of boring-mills, drill-presses,&c., make a chuck that is cheap and durable, and at the same time easyto handle. The jaw as a whole is reversible, and the. sliding jaw isalso capable of being reversed end for end.

Having thus described my invention, what I claim is l. In combinationwith the shell or body A, having the undercut end walls and theperforated lugs e at the ends, a sliding jaw B, a Vscrew C, foradjusting the jaw, and bolts E, passing through the perforated lugs andadapted to clamp the body in position, all substantially as shown anddescribed.

2. In combination with shell or body A, a face-plate jaw having alongitudinal opening along" its upper face from end to end, lugs a a,provided at their upper ends with bearings, the screw C, resting in saidbearings and having both ends squared, and a reversible slidingj aw B,having its lower face threaded and located wholly above the lugs a,whereby the jaw as a whole, its sliding jaw, and the screw may bereversed end for end.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

AUSTIN F. CUSHMAN.

WVitnesscs:

FRED. H. DEAN, E. L. CUSHMAN.'

